Elmer Phelps Train Robber my great grandfather

I am looking for any info on my great grandfather, Elmer Phelps. His death has been a family secret for many years. I have been looking for info for three years. I was given a tape of my grandmother talking about him. My grandfather and his siblings remember as children their daddy being carried in and laid on a table. he was bleeding and the next morning the children were told he died of pneumonia and were to never speak of him or his death again. He supposedly robbed a train at Sunbright Depot in 1926 and was shot. He worked at the New River Lumber Co. in Norma and was known for his drinking and gambling. I have no luck on death certificate and was told he was buried in the middle of the night next to his baby boy in Norma, in an unmarked grave. The family then moved back to Ky and Elmer was kept a secret. In the last years of my grandfathers life he did speak of his daddy to some people. I do not want Elmer to disappear from our family forever. Thanks for any info given.